* Merge

--HG--
branch : trunk

1 files changed, 96 insertions, 0 deletions

diff --git a/externals/mysql/my_tree.h b/externals/mysql/my_tree.h
new file mode 100644
index 00000000000..e387b25d431
--- /dev/null
+++ b/externals/mysql/my_tree.h
@@ -0,0 +1,96 @@
+/* Copyright (C) 2000 MySQL AB
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+#ifndef _tree_h
+#define _tree_h
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+#include "my_base.h"		/* get 'enum ha_rkey_function' */
+
+/* Worst case tree is half full. This gives use 2^(MAX_TREE_HEIGHT/2) leafs */
+#define MAX_TREE_HEIGHT	64
+
+#define ELEMENT_KEY(tree,element)\
+(tree->offset_to_key ? (void*)((uchar*) element+tree->offset_to_key) :\
+			*((void**) (element+1)))
+
+#define tree_set_pointer(element,ptr) *((uchar **) (element+1))=((uchar*) (ptr))
+
+#define TREE_NO_DUPS 1
+
+typedef enum { left_root_right, right_root_left } TREE_WALK;
+typedef uint32 element_count;
+typedef int (*tree_walk_action)(void *,element_count,void *);
+
+typedef enum { free_init, free_free, free_end } TREE_FREE;
+typedef void (*tree_element_free)(void*, TREE_FREE, void *);
+
+typedef struct st_tree_element {
+  struct st_tree_element *left,*right;
+  uint32 count:31,
+	 colour:1;			/* black is marked as 1 */
+} TREE_ELEMENT;
+
+#define ELEMENT_CHILD(element, offs) (*(TREE_ELEMENT**)((char*)element + offs))
+
+typedef struct st_tree {
+  TREE_ELEMENT *root,null_element;
+  TREE_ELEMENT **parents[MAX_TREE_HEIGHT];
+  uint offset_to_key,elements_in_tree,size_of_element;
+  ulong memory_limit, allocated;
+  qsort_cmp2 compare;
+  void *custom_arg;
+  MEM_ROOT mem_root;
+  my_bool with_delete;
+  tree_element_free free;
+  uint flag;
+} TREE;
+
+	/* Functions on whole tree */
+void init_tree(TREE *tree, ulong default_alloc_size, ulong memory_limit,
+               int size, qsort_cmp2 compare, my_bool with_delete,
+	       tree_element_free free_element, void *custom_arg);
+void delete_tree(TREE*);
+void reset_tree(TREE*);
+
+  /* similar to delete tree, except we do not my_free() blocks in mem_root */
+#define is_tree_inited(tree) ((tree)->root != 0)
+
+	/* Functions on leafs */
+TREE_ELEMENT *tree_insert(TREE *tree,void *key, uint key_size, 
+                          void *custom_arg);
+void *tree_search(TREE *tree, void *key, void *custom_arg);
+int tree_walk(TREE *tree,tree_walk_action action,
+	      void *argument, TREE_WALK visit);
+int tree_delete(TREE *tree, void *key, uint key_size, void *custom_arg);
+void *tree_search_key(TREE *tree, const void *key, 
+                      TREE_ELEMENT **parents, TREE_ELEMENT ***last_pos,
+                      enum ha_rkey_function flag, void *custom_arg);
+void *tree_search_edge(TREE *tree, TREE_ELEMENT **parents, 
+                        TREE_ELEMENT ***last_pos, int child_offs);
+void *tree_search_next(TREE *tree, TREE_ELEMENT ***last_pos, int l_offs, 
+                       int r_offs);
+ha_rows tree_record_pos(TREE *tree, const void *key, 
+                     enum ha_rkey_function search_flag, void *custom_arg);
+#define reset_free_element(tree) (tree)->free= 0
+
+#define TREE_ELEMENT_EXTRA_SIZE (sizeof(TREE_ELEMENT) + sizeof(void*))
+
+#ifdef	__cplusplus
+}
+#endif
+#endif